Precautions On Operation; Stopping A/D Conversion Operation; Trigger Input During A/D Conversion Operation; External Or Timer Trigger Interval - NEC UPD703116 User Manual

13.10 Precautions on Operation

13.10.1 Stopping A/D conversion operation

If 0 is written in the ADCE0 or ADCE1 bit of the ADSCM00 or ADSCM10 register during A/D conversion operation,
it stops A/D conversion operation and an A/D conversion result is not stored in the ADCR0n or ADCR1n register (n =
0 to 7).

13.10.2 Trigger input during A/D conversion operation

If a trigger is input during A/D conversion operation, that trigger input is ignored.

13.10.3 External or timer trigger interval

Make the trigger interval (input time interval) in external or timer trigger mode longer than the conversion time
specified by the FR2 to FR0 bits of the ADSCM01 or ADSCM11 register.
(1) When interval = 0
If multiple triggers are input simultaneously, they are processed as one trigger signal.
(2) When 0 < interval < conversion time
If an external or timer trigger is input during A/D conversion operation, that trigger input is ignored.
(3) When interval = conversion time
If an external or timer trigger is input at the same time as A/D conversion termination (comparison termination
signal and trigger contention), interrupt generation and ADCR0n or ADCR1n register storage of the value with
which conversion terminated are performed correctly (n = 0 to 7).

13.10.4 Operation in standby modes

(1) HALT mode
A/D conversion operation is suspended. If released by NMI or maskable interrupt input, the ADSCM00,
ADSCM10, ADSCM01, or ADSCM11 register and ADCR0n or ADCR1n register maintain their values (n = 0
to 7).
If released by RESET input, the ADCR0n or ADCR1n register is initialized.
(2) IDLE mode, software STOP mode
Since clock supply to A/D converter 0 or 1 stops, A/D conversion operation is not performed.
If released by NMI or maskable interrupt input, the ADSCM00, ADSCM10, ADSCM01, or ADSCM11 register
and ADCR0n or ADCR1n register maintain their values (n = 0 to 7). However, if IDLE mode or software
STOP mode is set during A/D conversion operation, A/D conversion operation stops.
If released by RESET input, the ADCR0n or ADCR1n register is initialized.
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CHAPTER 13 A/D CONVERTER
User's Manual U14492EJ5V0UD